Salix fragilis vs crack willow

Salix fragilis and crack willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix fragilis	Yes	No	No	No
crack willow	Yes	No	No	No

As nouns, Salix fragilis and crack willow are synonyms defined as:

Salix fragilis and crack willow: large willow tree with stiff branches that are easily broken

Other synonyms of Salix fragilis include brittle willow, snap willow.

Salix fragilis (noun)	crack willow (noun)
large willow tree with stiff branches that are easily broken	large willow tree with stiff branches that are easily broken